//Defines all pins on the Arduino Uno board in order of connection.
#define A  2
#define B  3 
#define C  4
#define D  5
#define E  6
#define F  7
#define G 8
static unsigned char counter10msec=0;
static unsigned char counter40msec=0;
static unsigned char counter100msec=0;
unsigned char counter=0;
static unsigned char num=0;
unsigned char display_array[]={~0x3F,~0x6,~0x5B,~0x4F ,~0x66, ~0x6D,~0x5F,~0x7,~0x7F,~0x6F,0x8,0x00,0x46,~0x3F,0x06,0x0E};


void display_on(byte num) // This function turns on the correct pins to display numbers passed to it // through the variable “num”.
{
int result = bitRead(num, 0); // Read the first binary entry in num and stores it in result.
if (result == 1) // Check to see if this segment should be on.
{
  digitalWrite(A, HIGH);
  } // Turns on the segment.
else // Otherwise, it turns it off.
{
  digitalWrite(A, LOW);
  } // Turns segment off.
result = bitRead( num, 1); // Same thing for the 6 remaining segments.
if (result == 1)
{
  digitalWrite(B, HIGH);
  }
else
{
  digitalWrite(B, LOW);
}
result = bitRead( num, 2);
if (result == 1)
{digitalWrite(C, HIGH);}
else
{digitalWrite(C, LOW);}
result = bitRead( num, 3);
if (result == 1)
{digitalWrite(D, HIGH);}
else
{digitalWrite(D, LOW);}
result = bitRead( num, 4);
if (result == 1)
{digitalWrite(E, HIGH);}
else
{digitalWrite(E, LOW);}

result = bitRead( num, 5);
if (result == 1)
{digitalWrite(F, HIGH);}
else
{digitalWrite(F, LOW);}

result = bitRead( num, 6);
if (result == 1)
{digitalWrite(G, HIGH);}
else
{digitalWrite(G, LOW);}
}

void Digitalpin_init(void)
{
pinMode(A, OUTPUT); // Making all pins outputs
pinMode(B, OUTPUT);
pinMode(C, OUTPUT);
pinMode(D, OUTPUT);
pinMode(E, OUTPUT);
pinMode(F, OUTPUT);
pinMode(G, OUTPUT);
pinMode(10,OUTPUT);
}

void Timer_Init(void)
{
  cli();                      /*stop interrupts for till we make the settings*/
  /*1. First we reset the control register to amke sure we start with everything disabled.*/
  TCCR0A = 0;                 /* Reset entire TCCR1A to 0 */
  TCCR0B = 0;                 /* Reset entire TCCR1B to 0 */
 
  /*2. We set the prescalar to the desired value by changing the CS10 CS12 and CS12 bits. */  
  TCCR0B |= B00000011;        /* Set CS10 and CS11 to 1 so we get prescalar 64  */
  
  /*3. We enable compare match mode on register A*/
  TIMSK0 |= B00000010;        /*Set OCIE1A to 1 so we enable compare match A */
  
  /*4. Set the value of register A to 31250*/
  OCR0A = 250;             /*Finally we set compare register A to this value*/  
  sei();                     /*Enable back the interrupts*/
}


void Task_100ms()
{
  display(num);
  count();
}
void count(void)
{
  if(counter>=10 )
  {
    counter=0;
    num=num+1;
    if(num>15)
    {
      num=0;
    }
  }
  else{
    counter++;
  }
}

void display(int a)
{
  display_on(display_array[a]);
}

/*****************************************************************/
void setup() {
  Serial.begin(115200);
   Digitalpin_init();
   Timer_Init();
  }

void loop() 
{
  if(counter10msec>=(10))
  {
    counter10msec=0;
    //Task_10ms();
  }
  else{
    /*Do Nothing*/
  }
  if(counter40msec>=(40))
  {
    counter40msec=0;
     //Task_40ms();
  }
  else{
   /*Do Nothing*/
  }
   if(counter100msec>=(100))
  {
    
    counter100msec=0;
    Task_100ms();
  }
  else{
    /*Do Nothing*/
  }
 
}
/********************do not change******/


/*With the settings above, this IRS will trigger each count */
ISR(TIMER0_COMPA_vect){
  TCNT0  = 0; /*First, set the timer back to 0 so it resets for next interrupt*/
  counter10msec++;  
  counter40msec++;
  counter100msec++; 

}